Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN LONDONDERRY
Londonderry Water Heater
Replacement
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See what replacement costs ↓LONDONDERRY AT A GLANCE
Replacing a water heater in Londonderry.
Londonderry's Building Division charges $100 plus $16 per fixture for residential plumbing changes and $50 to start for residential mechanical permits (November 2025 schedule). Eversource supplies most electricity, with NHEC in part of town. Liberty Utilities supplies gas, and NH DOE lists Pennichuck East for water.
- Permit to replace with the same type
- Check with the city · Town of Londonderry Building Division (268B Mammoth Road)
- Permit fee
- Residential plumbing additions or changes: $100 plus $16 per fixture. Residential mechanical: $50 to start plus $10 for each extra item (fee schedule effective 11/4/25).
- Who gets the permit
- Under New Hampshire law (RSA 153:36), you don't need a plumber's license for the plumbing that goes with installing a water heater. Homeowners can do their own plumbing in a single-family home, and their own gas work in a single-family home they live in, as long as they follow local permit and inspection rules. Other gas work needs a licensed fuel gas fitter.
- Electric utility
- Eversource (NH) and New Hampshire Electric Cooperative (NHEC)
- Gas utility
- Liberty Utilities (EnergyNorth)
- Water
- Pennichuck East Utility (listed by NH DOE)
- Typical home
- Built 1983 (median) · 84% owner-occupied
- Companies found
- 6 that advertise water heater work
01 / TYPICAL PRICES
What a new water heater costs.
Know before you call.
Heat-pump tank
$2,500–$5,000Typical cost, including installation
Tankless
$2,400–$5,400Typical cost, including installation
AI equipment illustrations; models vary and images are not to scale. Typical national prices from Home Depot ↗, checked September 28, 2026. The source doesn’t say how many jobs the ranges are based on. These are not Londonderry averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in Londonderry
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit feeResidential plumbing additions or changes: $100 plus $16 per fixture. Residential mechanical: $50 to start plus $10 for each extra item (fee schedule effective 11/4/25).. Town of Londonderry Building Division (268B Mammoth Road) fee source ↗
- Local company’s advertised price1 of the companies listed for Londonderry post water heater prices or specials on their websites: Walley's Heating & Air. Each offer has its own conditions.
- Measured local dataNot collected yet, so no Londonderry average is shown.
02 / COMPANIES WE FOUND
Who replaces water heaters in Londonderry?
Companies that advertise water heater replacement here, with what their water heater customers say.
Companies we found in our research. They are not Ember & Tank providers or partners. We show selected reviews, not a rating or every review. How we choose reviews →
Ace Hardware Home Services (Boston office)
Lists Londonderry among the areas it serves. Based in Billerica.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback Yelp reviewers praised a same-day emergency tankless installation and punctual, well-explained maintenance that included a hot water heater.
Worth knowing No water heater complaints found in the sources checked.
2 water heater reviews read, checked September 30, 2026.
East Coast HVAC
Lists Londonderry among the areas it serves. Based in Dover, NH.
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
What the reviews say
Water heater feedback A Yelp reviewer (2020) praised the team's communication, scheduling flexibility and respect for the home during a propane on-demand water heater installation.
Worth knowing A Yelp reviewer (Dec 2024) said a $4,100 water heater quote had no itemized costs, and another (2018) said they were told the company was not taking new customers; no company responses were visible.
3 water heater reviews read, checked September 30, 2026.
Sila Heating, Cooling, Plumbing & Electrical (Greater Boston)
Lists Londonderry among the areas it serves. Based in Stoneham.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback Yelp reviewers praised a free control adjustment and flat-rate flush (2026), a clear diagnosis of a leaking Bosch tankless unit (2026), and professional water heater and boiler replacements.
Worth knowing Yelp reviewers alleged replacement quotes ($5,400 in 2019; at least $12,000 in 2024) for problems others fixed for $350 and $750, and one (Jan 2026) said National Grid found a significant gas leak at a newly installed water heater's joint the day after installation; no company responses were visible on these.
5 water heater reviews read, checked September 30, 2026.
Walley's Heating & Air
Lists Londonderry among the areas it serves. Based in Nashua, NH.
- Tank
- Tankless
- Heat pump
- Emergency service
Published price: Fall specials (NH service region, residential up to 4 units): electric water heater replacements starting at $1,999 (40-gal; +$100 for 50-gal); chimney vent from $2,199 (40-gal; +$200 for 50-gal); power vent from $2,999 (40-gal; +$200 for 50-gal). Includes town permit, inspection, old tank removal, install and connections as-is; code-upgrade accessories, relocation or fuel conversion extra.
What the reviews say
Water heater feedback Yelp reviewers praised thorough proposals, competitive pricing, a 5-year labor warranty, smooth project management and clean installations, including follow-up on a post-install sediment issue.
Worth knowing No water heater complaints found in the sources checked.
3 water heater reviews read, checked September 30, 2026.
Dry Air Systems
Lists Londonderry among the areas it serves. Based in Newburyport.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Mr. Rooter Plumbing of Greater New Hampshire
Lists Londonderry among the areas it serves. Based in Manchester, NH.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Order: companies based in Londonderry first, then companies whose water heater reviews we’ve read. Each group is alphabetical. These businesses are not our employees or vetted partners and do not receive requests from Ember & Tank. We haven’t checked their license, insurance or quality of work. NH OPLC license lookup ↗.
See before-and-after replacement examples from independent companies →
HOMES IN LONDONDERRY
What Londonderry homes are like.
1983Median year built
44%Built before 1980
84%Owner-occupied
16%Heat with utility gas
79%Single-family homes
The median home was built in 1983. A first or second replacement is common in homes this age.
U.S. Census Bureau, American Community Survey ACS 2024 5-year ↗ (2020-2024). Heating fuel is what homes use to heat the house. It often, but not always, matches the water heater’s fuel.
ENERGY & WATER
Who supplies Londonderry homes.
Energy
- Electric: Eversource (NH) (most of town)
- Electric: New Hampshire Electric Cooperative (NHEC) (NH DOE lists NHEC as also serving part of Londonderry)
- Gas: Liberty Utilities (EnergyNorth)
NH Department of Energy: Utilities by City/Town (Wayback copy, Sept 2026; live site returned 403) ↗ · NH PUC natural gas communities served map (Wayback copy, July 2024) ↗
Water
Pennichuck East Utility (listed by NH DOE)
NH Department of Energy: Utilities by City/Town (Wayback copy, Sept 2026; live site returned 403) ↗
REBATES & CREDITS
Rebates for Londonderry homes.
For Eversource (NH), New Hampshire Electric Cooperative (NHEC) and Liberty Utilities (EnergyNorth) customers in Londonderry. Ask installers for the price before rebates, then check with the program that you qualify.
- Federal Energy Efficient Home Improvement Credit (25C) ↗EndedCovered improvements made through December 31, 2025.
Checked September 30, 2026. Who qualifies and the conditions: New Hampshire rebates · How to check an incentive.
PERMITS & LICENSING
Permits and licenses in Londonderry.
Permits and who issues them
Londonderry's Building Division issues residential plumbing and mechanical permits under a fee schedule that took effect November 4, 2025. The pages we read don't say whether swapping in the same type of water heater needs a plumbing permit, a mechanical (gas) permit, or both.
Town of Londonderry Building Division (268B Mammoth Road) ↗ · Londonderry Permitting Fee Schedule (effective 11/4/25) ↗ · RSA 153:36 Exceptions (NH General Court) ↗
Check the installer’s license
Ask for the license number and search it yourself on the NH OPLC license lookup ↗. A listing on Ember & Tank is not a license check. New Hampshire licensing explained →
NEARBY CITIES
Compare places near Londonderry.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Derry | 5 mi | Required | $35 | Eversource (Public Service of New Hampshire), Unitil |
| Hampton | 28 mi | Required | $60 | Unitil, Eversource (Public Service of New Hampshire) |
| Durham | 30 mi | Required | $50 | Eversource (NH), New Hampshire Electric Cooperative (NHEC) |
| Portsmouth | 33 mi | Required | $75, | Eversource (NH) |
| Dover | 33 mi | Required | $6 | Eversource (NH) |
| Rochester | 36 mi | Required | — | Eversource (NH) |
COMMON QUESTIONS
Londonderry water heater questions.
What are Londonderry's residential plumbing permit fees?
$100 plus $16 per fixture for additions or changes. Residential mechanical permits are $50 to start plus $10 for each extra item (effective Nov. 4, 2025).
Who supplies natural gas in Londonderry?
Liberty Utilities. Seacoast towns get gas from Unitil instead.
NH Department of Energy: Utilities by City/Town (Wayback copy, Sept 2026; live site returned 403) ↗ · NH PUC natural gas communities served map (Wayback copy, July 2024) ↗
More guides: New Hampshire water heater replacement · All local guides